LQL – Loudness Quality Logger

Multi point networked loudness logging

Free PC software for owners of TouchMonitors with the Logging Data Server license


LQL version 1.7 is now available.
Version 1.7 offers enhanced handling of time ranges as well as an expanded numerical display that now shows start and end time.

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With the LQL - Loudness Quality Logger RTW offers a logging console that collects data from various TouchMonitor devices directly via IP connection or external USB storage devices in order to provide an offline storage capability that goes along with some add on features.

  • Free logging console for Windows®-based PC systems
  • Collection of Loudness and TruePeak data via IP connection or USB storage devices
  • Adjustable limits to indicate and to log deviations

The Principle

The Loudness Quality Logger provides logging of timecode or realtime based loudness and TruePeak data from TouchMonitor TM7, TMR7, and TM9 series with activated Loudness and Logging Data Server license. The Logging instrument available with the Logging Data Server license should run in IP mode. A maximum of two audiogroups per unit (20 units max.) can be set to provide data to be collected by the LQL. Main and secondary limits may be applied and can be used to generate various alarms to indicate and to log the exceeding of limits set by legal or in-house regulations for example. All status information of the device is stored with the logged data.
If the logging instrument on the TouchMonitor was operated in USB mode and the data was recorded on a USB storage medium, these can also be recorded and read out with the LQL.


  • Logging console for Windows® OS based PC's
  • Timecode or realtime based collection of Loudness and TruePeak data of various TM7, TMR7, or TM9 units
  • Offline storage capability with additional features
  • Up to 20 devices with a maximum of two audio groups including the Logging instrument can be connected (precondition: licence SW20014 is activated)
  • Data collection via IP connection or from external USB memory devices
  • Status overview of connected units and audio groups (main window)
  • Graphical view of logged data over time of an audio group with up to four permanently captured parameters (detail window)
  • Different scaling factors for the display of different spans of time
  • Two-stage definition of limits to signal violations
  • Markers for sequential analysis
  • Numerical view of all measured parameters

Some Details

At its kernel, the LQL - Loudness Quality Logger software continuously records the data and stores it in the background. The user interface connects and monitors the devices in a main or overview window and the recorded data is continuously displayed graphically in optional detail windows.

The main window gives an overview about the connected audio devices and their audio groups being enabled to deliver Loudness and TruePeak data. In addition, quality of service for the connection and data is indicated by the colors of the traffic lights. TouchMonitor devices as well as their audio groups need to have biunique names to be able to communicate with LQL. Using the Add dialog, the LQL will access the device with its IP address and indicate it by its name. A click to the connected audio group opens a detail window showing the data of this group.

Data of an audio group being collected in the background will be calculated and displayed in the detail window as a graph according to the selected values and scaling factor. Up to four values can be displayed in any combination at a time with enabled (Live) or disabled (Freeze) continuously updating graph. In the numerical display section, all four values are permanently visible. Also, the continuously upadting time stamp of TouchMonitor's time setting and start and end time of the data capture is displayed. A rough estimated point of time can be refined using one of the scaling factors or be jumped to by using the GO TO TIME function. The MARKS ON function allows to place markers in the graph selecting a section that will get a numerical recalculation.

In the menu settings of the LQL, the Main Alarm Threshold Set menu is used to set main limits according to legal regulations or the requirements of current loudness standards for example.
The Secondary Alarm Threshold Set menu is used to set additional thresholds according to in-house regulations for example. They should be set to a tighter value than the corresponding main limits to
assure the possibility of potential corrections of the actual program material. If secondary limits are indicated as exceeded, the engineer can regulate the program early enough to keep it in balance to the
main limits allowed.
The alarm thresholds set in LQL represent individual helpful marks, but they don't perform any modifications to the actual audio streams.

Operation Requirements

  • PC with Dual-Core processor, min. 2.5 GHz
  • Microsoft® Windows® 8.1 or higher
  • Min. 2 GB RAM, 4 GB RAM recommended
  • Min. 50 MB hard disc storage left
  • Additional disc space recommended for storing logging data and backups
    (amount depends on number of connected audio groups)
  • Network connection
  • TouchMonitor with Logging instrument activated and connected to the network


   LQL – Loudness Quality Logger